prime number in c++
#include<iostream>
using namespace std;
int main()
{
int n;
bool c=1;
cin >> n;
if (n <= 1)
{
cout << "NO\n";
}
else
{
for (int i = 2; i < n; i++)
{
if (n % i == 0)
{
c=0;
break;
}
}
if (!c)
cout << "NO\n";
else
cout << "YES\n";
}
return 0;
}find prime number c++
#include <math.h>
// time: O(sqrt(n)) .. space: O(1)
bool isPrime(int n) {
if (n < 2) return false;
int iter = 2;
while(iter <= sqrt(n)) {
if (n % iter == 0) return false;
iter++;
}
return true;
}prime number c++
template<class T> bool isPrime(T n)
{
T i;
if(i<2) return false;
for(i = 2; i * i <= n; i++) {
if(n % i == 0) return false;
}
return true;
}Copyright © 2021 Codeinu
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